Mechanistic implications of redox cycles solar reactions of recyclable layered double hydroxides nanoparticles for remazol brilliant abatement

In the current study, the Layered Double Hydroxide (LDH) containing combinations of iron, magnesium-iron and zinc-iron as a modified Fenton-Like reaction to investigate its catalytic activity as a solar photocatalyst is investigated. In this regard, magnetic Fe2+/Fe3+, Mg2+/Fe3+ and Zn2+/Fe3+ catalysts were successfully fabricated via a simple co-precipitation technique and then characterized through X-ray diffraction and a high-resolution Transmission Electron Microscope. The prepared catalysts evaluated as heterogeneous solar Fenton-Like treatment facility. The results revealed that the application of LDH catalysts incorporated with H2O2, promoting Fenton-Like reaction for synthetic textile wastewater effluents loaded with Remazol Brilliant Blue R dye mineralization. The catalytic activity of LDH system was systematically evaluated through testing the reaction conditions including initial pH, LDH catalyst and H2O2 doses, initial load of dye in wastewater and finally the solar radiation time. Under the optimal conditions that are optimized through factorial design, the LDH-Fenton-Like system could be reached to 74% removal within 15-min of solar irradiance time in acidic pH (about 3.0). For the all studied systems, the reaction is exothermic, non-spontaneous in nature and works at low-energy barrier. The catalysts are being reused after recovery for six reaction cycles with only 10% reduction in its activity. Hence, the recycling approach is effective and highlighting the potential of recovering and reusing magnetized nanoparticles for economic large-scale water treatment applications.

Automated summary

The study investigated the catalytic activity of Layered Double Hydroxide (LDH) as a solar photocatalyst, showing its efficacy in promoting Fenton-Like reaction for treating synthetic textile wastewater containing dyes. The optimized LDH-Fenton-Like system achieved high removal efficiency under acidic conditions and maintained activity after multiple reaction cycles.